Display device

Abstract

A liquid crystal display device which provides reliable connection between a semiconductor device and a printed circuit board includes a liquid crystal display panel, a printed circuit board disposed close to the liquid crystal display panel, and a semiconductor device of a film carrier type which is disposed to lie between the liquid crystal display panel and the printed circuit board, and terminals of the semiconductor device are respectively connected by an anisotropic conductive film to terminals of the printed circuit board that are disposed in opposition to the respective terminals of the semiconductor device.

1. A display device comprising:
 a display panel; 
 a printed circuit board; and 
 a semiconductor device of a film carrier type which is disposed to lie between the display panel and the printed circuit board and is mounted on a film carrier, 
 first terminals of the film carrier being connected to terminals of the printed circuit board by a first anisotropic conductive film, while second terminals of the film carrier are connected to terminals of the display panel by a second anisotropic conductive film, 
 the first anisotropic conductive film for connecting the terminals of the printed circuit board to the first terminals of the film carrier being formed to have a lower melting point than the second anisotropic conductive film for connecting the terminals of the display panel to the second terminals of the film carrier. 
 
   
   
     2. A display device comprising:
 a display panel; 
 a printed circuit board; and 
 a semiconductor device of a film carrier type which is disposed to lie between the display panel and the printed circuit board and is mounted on a film carrier, 
 first terminals of the film carrier being connected to terminals of the printed circuit board by a first anisotropic conductive film, while second terminals of the film carrier are connected to terminals of the display panel by a second anisotropic conductive film, 
 conductive beads which are contained in the second anisotropic conductive film for connecting the terminals of the display panel to the second terminals of the film carrier being set to be higher in density than conductive beads which are contained in the first anisotropic conductive film for connecting the terminals of the printed circuit board to the first terminals of the film carrier. 
 
   
   
     3. A display device comprising:
 a display panel; 
 a printed circuit board; and 
 a semiconductor device of a film carrier type which is disposed to lie between the display panel and the printed circuit board and is mounted on a film carrier, 
 first terminals of the film carrier being connected to terminals of the printed circuit board by a first anisotropic conductive film, while second terminals of the film carrier are connected to terminals of the display panel by a second anisotropic conductive film, 
 conductive beads which are contained in the second anisotropic conductive film for connecting the terminals of the display panel to the second terminals of the film carrier being set to be smaller in size than conductive beads which are contained in the first anisotropic conductive film for connecting the terminals of the printed circuit board to the first terminals of the film carrier. 
 
   
   
     4. A display device comprising:
 a display panel; 
 a printed circuit board; and 
 at least one semiconductor device of a film carrier type which is disposed to lie between the display panel and the printed circuit board and is mounted on a film carrier; 
 first terminals of the film carrier being connected to terminals of the printed circuit board by a first anisotropic conductive film, while second terminals of the film carrier are connected to terminals of the display panel by a second anisotropic conductive film, 
 the first anisotropic conductive film for connecting the terminals of the printed circuit board to the first terminals of the film carrier having a physical property which differs from a physical property of the second anisotropic conductive film for connecting the terminals of the display panel to the second terminals of the film carrier. 
 
   
   
     5. A display device according to  claim 4 , wherein the physical property is at least one of melting point and relation of conductive bends. 
   
   
     6. A display device according to  claim 5 , wherein a melting point of the first anisotropic conductive film for connecting the terminals of the printed circuit board to the first terminals of the film carrier is lower than a melting point of the second anisotropic conductive film for connecting the terminals of the display panel to the second terminals of the film carrier. 
   
   
     7. A display device according to  claim 5 , wherein the physical property is at least one of size and density of the conductive beads. 
   
   
     8. A display device according to  claim 7 , wherein a size of conductive beads in the first anisotropic conductive film for connecting the terminals of the printed circuit board to the first terminals of the film carrier is larger than a size of conductive beads in the second anisotropic conductive film for connecting the terminals of the display panel to the second terminals of the film carrier. 
   
   
     9. A display device according to  claim 7 , wherein a density of conductive beads in the first anisotropic conductive film for connecting the terminals of the printed circuit board to the first terminals of the film carrier is lower than a density of conductive beads in the second anisotropic conductive film for connecting the terminals of the display panel to the second terminals of the film carrier.